Pathogen of root surface caries in the elderly

Abstract:Objective To study the pathogen of root surface caries in the elderly. Methods Plaque samples from the experimental group and the control group were collected. After culturing in selective and non-selective media, the different bacteria were isolated. The counts and the positive rates of total bacteria, porphyromonas group, pervotella group, streptococcus mutants group, actinomyces group and lactobacillus group were compared.Results The counts of total bacteria, streptococcus mutants, actinomyces and lactobacillus of the experimental group were higher than those of the control group. The positive rates of actinomyces and lactobacillus of the experimental group were significantly higher than those of the control group. Conclusion Actinomyces and lactobacillus are the main related pathogens of root surface caries in the elderly.

根面龋病灶微生物学研究

作者对13例根面龋患者病灶微生态系中的变形链球菌、乳酸杆菌、粘性放线菌进行定量研究。结果显示,变形链球菌在数量上占绝对优势,乳酸杆菌也较多,而粘性放线菌仅在1例中检出。故支持变形链球菌是根面龋和冠龋共同病原菌的观点。

2型糖尿病患者龈上菌斑致龋菌分布与功能研究

目的探讨2型糖尿病患者口腔微生物中致龋菌群落分布特征与功能基因,提高对2型糖尿病与龋病关系的认识。方法试验组选取空军军医大学第一附属医院内分泌科口腔健康的2型糖尿病患者(10例);正常对照组选取社区人群中口腔健康且不患2型糖尿病受试者(10例)。采集口腔健康的2型糖尿病患者组和正常对照组的龈上菌斑样本,分别进行宏基因组学测序,对变异链球菌、乳酸杆菌、黏性放线菌、白色念珠菌等致龋菌进行生物信息学及统计学分析。结果口腔健康的2型糖尿病患者龈上菌斑样本中变异链球菌、乳酸杆菌、黏性放线菌、白色念珠菌丰度稍低于正常对照组,但差异均无统计学意义(P>0.05)。KEGG Pathway功能代谢差异分析结果显示2型糖尿病患者龈上菌斑微生物的D-精氨酸和D-鸟氨酸代谢、生物膜形成-大肠杆菌代谢、己内酰胺降解、精氨酸生物合成等代谢通路较正常对照组丰富,而硫胺素代谢、硒化合物代谢、丙酮酸代谢等代谢通路较正常对照组降低。结论口腔健康的2型糖尿病患者的致龋菌含量与正常对照组并无明显差异,功能基因差异代谢途径表明精氨酸代谢通路富集,有助于维持口腔微生态坏境的酸碱平衡。